Ans: Chemistry Q&A: PF3, CO3^-2, NF3, Gas Volume, Ag2CrO4, Molar Volume

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The discussion addresses key chemistry concepts, including the Lewis structure of PF3, which features one nonbonding and three bonding electron pairs around phosphorus. It explores that CO3^-2 has three equivalent resonance forms with carbon as the central atom. The bond angle in NF3 is noted to be slightly less than 109.5 degrees due to lone pair repulsion. A gas sample of 1.3 mol is calculated to occupy a specific volume at given temperature and pressure conditions. The formula weight of silver chromate (Ag2CrO4) and the molar volume of gas at STP are also discussed, emphasizing the importance of showing work for assistance.
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#1) The Lewis structure of PF3 shows that central phosphorus atom has ___ nonbonding and ___ bonding electron pairs.
#2) How many equivalent resonance forms can be drawn for CO3^-2? (carbon is the central atom)
#3) The bond angle in NF3 is slightly less than ___?
#4) Sample of gas (1.3mol) occupies ____L at 22 Celcius and 2.5 atm.
#5)The formula weight of silver chromate (Ag2CrO4) is ______ amu
#6) The molar volume of gas at STP is _____ L.
 
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